Answer: 3x + 4y = 11.
- A 3x + 4y = 11
- B 3x + 4y = 5
- C 4x + 3y = 10
- D 3x - 4y = -5
Correct answer: A. 3x + 4y = 11
Explanation: Parallel: same slope. Line is 3x + 4y = k. Substitute (1,2): 3+8 = 11. So 3x + 4y = 11.
The slope of a line is the ratio of vertical change (rise) to horizontal change (run) between any two points on it - equivalently, the tangent of the angle θ the line makes with the positive x-axis.